package com.lagou.dao.impl;

import com.lagou.dao.CourseContentDao;
import com.lagou.pojo.Course;
import com.lagou.pojo.Course_Lesson;
import com.lagou.pojo.Course_Section;
import com.lagou.utils.DateUtils;
import com.lagou.utils.DruidUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import java.sql.SQLException;
import java.util.List;

public class CourseContentDaoImpl implements CourseContentDao {

    //根据课程ID查询课程相关信息
    @Override
    public List<Course_Section> findSectionAndLessonByCourseId(int courseId) {

        try {
            //创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //编写SQL
            String sql = "SELECT\n" +
                    "id,\n" +
                    "course_id,\n" +
                    "section_name,\n" +
                    "description,\n" +
                    "order_num,\n" +
                    "STATUS\n" +
                    "FROM course_section WHERE course_id = ?";

            //执行查询
            List<Course_Section> sectionList = qr.query(sql, new BeanListHandler<Course_Section>(Course_Section.class), courseId);

            //根据章节ID查询课时信息
            for(Course_Section cs:sectionList){
                //调动方法
                List<Course_Lesson> lessonList = findLessonBySectionId(cs.getId());
                //将课时数据封装到章节对象中
                cs.setCourseLessonList(lessonList);
            }

            return sectionList;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }

    }

    //根据章节ID查询课时信息
    @Override
    public List<Course_Lesson> findLessonBySectionId(int sectionId) {

        try {
            //创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //编写SQL
            String sql = "SELECT\n" +
                    "id,\n" +
                    "course_id,\n" +
                    "section_id,\n" +
                    "theme,\n" +
                    "duration,\n" +
                    "is_free,\n" +
                    "order_num,\n" +
                    "STATUS\n" +
                    "FROM course_lesson WHERE section_id = ?";

            List<Course_Lesson> lessonList = qr.query(sql, new BeanListHandler<Course_Lesson>(Course_Lesson.class), sectionId);

            return lessonList;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //根据课程ID 回显课程信息
    @Override
    public Course findCourseByCourseId(int courseId) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "select id,course_name from course where id = ?";

            Course course = qr.query(sql, new BeanHandler<Course>(Course.class), courseId);

            return course;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //保存章节信息
    @Override
    public int saveSection(Course_Section course_section) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "INSERT INTO course_section(\n" +
                    "course_id,\n" +
                    "section_name,\n" +
                    "description,\n" +
                    "order_num,\n" +
                    "STATUS,\n" +
                    "create_time,\n" +
                    "update_time)VALUES(?,?,?,?,?,?,?)";

            Object[] param = {course_section.getCourse_id(),course_section.getSection_name(),course_section.getDescription(),
            course_section.getOrder_num(),course_section.getStatus(),course_section.getCreate_time(),course_section.getUpdate_time()};

            int row = qr.update(sql, param);

            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改章节信息
    @Override
    public int updateSection(Course_Section section) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "UPDATE course_section SET\n" +
                    "section_name = ?,\n" +
                    "description = ?,\n" +
                    "order_num = ?,\n" +
                    "update_time = ? WHERE id = ?";

            Object[] param = {section.getSection_name(),section.getDescription(),section.getOrder_num(),
                    section.getUpdate_time(),section.getId()};

            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改章节状态
    @Override
    public int updateSectionStatus(int id, int status) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "UPDATE course_section SET STATUS = ?,update_time = ? WHERE id = ?";

            Object[] param = {status, DateUtils.getDateFormart(),id};

            int row = qr.update(sql, param);

            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //保存课时信息
    @Override
    public int saveLesson(Course_Lesson lesson) {

        try {
            //创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            //编写sql
            String sql = "INSERT INTO course_lesson(\n" +
                    "course_id,\n" +
                    "section_id,\n" +
                    "theme,\n" +
                    "duration,\n" +
                    "is_free,\n" +
                    "order_num,\n" +
                    "STATUS,\n" +
                    "create_time,\n" +
                    "update_time)VALUES(?,?,?,?,?,?,?,?,?)";

            //准备数据
            Object[] param = {lesson.getCourse_id(),lesson.getSection_id(),lesson.getTheme(),
            lesson.getDuration(),lesson.getIs_free(),lesson.getOrderNum(),lesson.getStatus(),
            lesson.getCreate_time(),lesson.getUpdate_time()};

            //执行插入操作
            int row = qr.update(sql, param);

            //返回结果
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改课时信息
    @Override
    public int updateLesson(Course_Lesson lesson) {

        try {
            //创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            //编写sql
            String sql = "UPDATE course_lesson SET\n" +
                    "theme = ?,\n" +
                    "duration = ?,\n" +
                    "is_free = ?,\n" +
                    "order_num = ?,\n" +
                    "update_time = ? WHERE id = ?";

            //准备数据
            Object[] param = {lesson.getTheme(),lesson.getDuration(),lesson.getIs_free(),
            lesson.getOrderNum(),lesson.getUpdate_time(),lesson.getId()};

            //执行更新操作
            int row = qr.update(sql, param);

            //返回结果
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }
}
